Asymmetric active sites originate from high-entropy metal selenides by joule heating to boost electrocatalytic water oxidation

Joule, Journal Year: 2024, Volume and Issue: 8(8), P. 2342 - 2356

Published: June 25, 2024

Language: Английский

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Pumping Electrons from Oxygen-Bridged Cobalt for Low-Charging-Voltage Zn-Air Batteries

Nano Letters, Journal Year: 2024, Volume and Issue: 24(43), P. 13653 - 13661

Published: Oct. 21, 2024

Reducing the charging voltage is a prerequisite for improving chargeability and energy efficiency of Zn-air batteries (ZABs). Herein, Fe

Language: Английский

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Oxygen Plasma Triggered Co‐O‐Fe Motif in Prussian Blue Analogue for Efficient and Robust Alkaline Water Oxidation

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 16, 2024

In the context of oxygen evolution reaction (OER), construction high-valence transition metal sites to trigger lattice oxidation mechanism is considered crucial for overcoming performance limitations traditional adsorbate mechanism. However, dynamic during poses significant challenges stability sites, particularly in high-current-density water-splitting systems. Here, we have successfully constructed Co-O-Fe catalytic active motifs cobalt-iron Prussian blue analogs (CoFe-PBA) through plasma bombardment, effectively activating reactivity while sustaining robust stability. Our spectroscopic and theoretical studies reveal that bridged enable a unique double-exchange interaction between Co Fe atoms, promoting formation species as OER centers maintaining low-valence state, preventing its dissolution. The resultant catalyst (CoFe-PBA-30) requires an overpotential only 276 mV achieve 1000 mA cm

Language: Английский

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Iron‐Induced Localized Oxide Path Mechanism Enables Efficient and Stable Water Oxidation

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 6, 2024

Abstract The sluggish reaction kinetics of the anodic oxygen evolution (OER) and inadequate catalytic performance non‐noble metal‐based electrocatalysts represent substantial barriers to development anion exchange membrane water electrolyzer (AEMWE). This study performed synthesis a three‐dimensional (3D) nanoflower‐like electrocatalyst (CFMO) via simple one‐step method. substitution Co with Fe in structure induces localized oxide path mechanism (LOPM), facilitating direct O−O radical coupling for enhanced O 2 evolution. optimized CFMO‐2 demonstrates superior OER performance, achieving an overpotential 217 mV at 10 mA cm −2 , alongside exceptional long‐term stability minimal degradation after 1000 h operation 1.0 M KOH. These properties surpass most conventional noble electrocatalysts. Furthermore, assembled AEMWE system, utilizing CFMO‐2, operates cell voltage 1.65 V deliver A . In situ characterizations reveal that, addition traditional adsorbate (AEM) isolated sites, new LOPM occurred around bimetallic sites. First‐principles calculations confirm greatly reduced energy barriers. work highlights potential improving design AEMWE.

Language: Английский

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Manipulating d‐Band Center of Ru Sites in Branched RuO₂ Nanofibers Enables Significantly Enhanced Alkaline Overall Water Splitting Performance

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 9, 2024

Abstract Although ruthenium dioxide (RuO 2 ) is an efficacious oxygen evolution reaction (OER) catalyst in acidic media, its performance alkaline conditions subpar and it also ineffective for hydrogen (HER) common electrolytes. Here, effective phosphorus (P)‐doping strategy introduced to manipulate the d ‐band center of (Ru) sites, attenuating adsorption energy HER intermediates lowering barrier OER, thereby significantly accelerating both OER performance. The representative 10%P‐RuO nanofibers (NFs) presents ultralow overpotential 177.9 mV at 1 A cm −2 long‐term stability 300 h m KOH toward HER, greatly exceeding those benchmark platinum (Pt)/C catalyst. Moreover, NFs exhibits exceptional with a low 250 10 mA (η desirable 150 , which far better than commercial RuO many other typical previously reported catalysts. Additionally, overall water electrolytic cell using as anode cathode necessitates working voltage 1.52 V demonstrates over 100 outperforming electrolysis cells.

Language: Английский

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Durable and high-performance perfluorinated anion exchange membrane for pure-water-fed electrolysis

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 101, P. 692 - 701

Published: Jan. 5, 2025

Language: Английский

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Uncovering the role of the Cr dopant in RuO₂ in highly efficient acid water oxidation

Dalton Transactions, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

The design of acidic oxygen evolution reaction (OER) electrocatalysts with high activity and durability is the key to achieving efficient hydrogen production. Herein, we report a Cr-doped RuO

Language: Английский

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Electrostatic self-adsorption synthesis of phosphorus-doped cobalt-based self-supported electrode for high-efficiency anodic OERs

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 105, P. 771 - 777

Published: Jan. 27, 2025

Language: Английский

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Design of RuO_x Electrocatalysts Containing Metallic Ru on the Surface to Accelerate the Alkaline Hydrogen Evolution Reaction

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

The development of water splitting technology in alkaline medium requires the exploration electrocatalysts superior to Pt/C boost hydrogen evolution reaction (HER). Ruthenium oxides with strong dissociation ability are promising candidates; however, lack combination sites immensely limits their performance. Herein, we reported a unique RuOx catalyst metallic Ru on its surface through simple cation exchange method. We demonstrated that formation greatly enhances interaction between and adsorbed (*H), resulting extremely high HER activity media. Moreover, proposed potential zero charge (Epzc) as descriptor ruthenium-base catalysts for first time revealed existence optimizes Epzc toward region. As result, designed achieves an overpotential only 18 mV at current density 10 mA cm–2. Furthermore, 1.80 V reach 800 cm–2 anion membrane electrolyzer, outperforming benchmark Pt/C.

Language: Английский

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Rapid Outgassing of Hydrophilic TiO2 Electrodes Achieves Long-Term Stability of Anion Exchange Membrane Water Electrolyzers

Nano-Micro Letters, Journal Year: 2025, Volume and Issue: 17(1)

Published: March 13, 2025

Abstract The state-of-the-art anion-exchange membrane water electrolyzers (AEMWEs) require highly stable electrodes for prolonged operation. stability of the electrode is closely linked to effective evacuation H 2 or O gas generated from surface during electrolysis. In this study, we prepared a super-hydrophilic by depositing porous nickel–iron nanoparticles on annealed TiO nanotubes (NiFe/ATNT) rapid outgassing such nonpolar gases. NiFe/ATNT exhibited an overpotential 235 mV at 10 mA cm −2 oxygen evolution reaction in 1.0 M KOH solution, and was utilized as anode AEMWE achieve current density 1.67 A 1.80 V. addition, with electrode, which enables outgassing, showed record 1500 h 0.50 under harsh temperature conditions 80 ± 3 °C.

Language: Английский

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